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The first thing a young civil servant will have in mind is to buy a car right after he joins the services. This is not his fault, it is the system which allows him to think like this. If he has a car, every time he goes on a tour he can claim milage weather or not he drives his car or takes a bus or hitches a ride. This is the only way he can pay for his hotel charges and food. The DSA is not enough for food and hotel so he has to claim milage.
Most offices have pool vehicles but when people have to go on tour they prefer taking their own vehicles so that they can claim milage.
The only way to stop this kind of corruption is to increase and standardize the DSA for all level of civil servants and not give milage. Or we could either continue the same and say this form of claims is not corruption